Manufacture of colored lacquers and coating compositions



Patented Jan. 25 19 38 UNITED STATES PATENT OFFICE MANUFACTURE OF COLORED LACQUERS AND COATING COMPOSITIONS N0 Drawing. Application September 25, 1935, Serial No. 42,136. In Germany January 20,

10 Claims.

In my U. S. patent application Ser. No. 702,097, filed December 12, 1933, there is described a process for making colored lacquers and coatings in the form of films which consists in dissolving in the lacquer to be colored a dyestufi of the triarylmethane series or a leuco-body thereof, both having groups capable of being mordanted, and developing the dyestuff or leuco-body to the colored chromium compound by means of chromic acid or a salt thereof.

The present invention is an improvement in or modification of that described, above and is based on the observation that the process is not limited to the production of complex chromium color-lakes, but may be extended generally to those metals which are suitable for making colorlakes. In other respects the process remains the same; the dyestufi is dissolved in the lacquer to be colored in the form of the dyestufi acid or a salt thereof; the mordant compound is added either simultaneously or in succession, generally while gently warming, whereby the formation of colorlake begins directly. Filtering is unnecessary and the lacquer is immediately available for use.

The coatings and films produced from the colored lacquers thus made are characterized in general by good fastness to light, but for the most part are somewhat inferior in this respect to the chromium lakes. On the other hand, by having at disposal several metals to form the complex dyes, color-lakes of all tints and with any desired properties can be made to satisfy the various demands.

The available metals include all those which are used for the production of dyestufi metal salts, particularly copper, nickel, cobalt and iron salts. They may be used separately or mixed together.

Almost any lacquer or varnish forming films grams of nitrocellulose lacquer and 0.25 gram of copper acetate is added; the brillant blue color is developed by gently warming.

Example 2 0.5 gram of the dyestufi acid from Eriochrome Cyanine R (Color Index 722), 100 grams of acetyl-cellulose lacquer and 1.5 grams of cobalt acetate are converted, as indicated in the foregoing examples, into a violet-red lacquer.

Example 4 0.5 gram of the triphenylmethane dyestuif acid made from one mol. of 2-chloro-4-dimethylaminobenzaldehyde and two mol. of 2-hydroxy- 3-methyl-benzene-carboxylic acid, 100 grams of spirit lacquer and 1.5 grams of nickel acetate are converted in the manner described above into a red-violet lacquer.

Example 5 0.5 gram of the dyestuff acid used in Example 4, 100 grams of nitrocellulose lacquer and 1.5 grams of ferrous acetate or the equivalent mixture of ferrous sulphate and sodium acetate are made up into a blue lacquer in the manner described above.

Example 6 0.5 gram of the mordant dyestuif of the phthalein series, obtainable by condensing phthalic anhydride, dimethyl-m-aminophenol and presorcylic acid in molecular proportions, 100 grams of nitrocellulose lacquer and 0.5 gram of copper acetate, are developed to a brilliant red lacquer in the manner described above.

What I claim is:-

1. A process for the manufacture of complex compounds containing a triarylmethane dyestuff, a metal selected from the group consisting of Cu, Fe, Co and Ni and a cellulose derivative, comprising treating the dyestufi acid of a triarylmethane dyestufl which contains at least once in the molecule the groups OH and COOI-I in ortho position to one another, in presence of a cule the groups OH and COOH in ortho positii u v to one another, in presence of a nitro -pellUJQS? lacquer with an acetate of a the group consisting of Cu, Fe, Coand'NiL" 3. A process for the manufacture of. complex;

compounds, containing a triarylmethane. dye: stufi, a metal selected front the group of (In Fe, Co and Ni and a cellulosejfdeifiyatiygfc treating the dyestufl aci'd'of aI triafryl dyestuff which contains at least once in the molecule the groups OH and COOH in ortho position compounds containing a. triarylmethane dyestufi, copper and a cellulose. derivative, comprising "estufi a. "d. offEriochrome,,AzurolB inpres e v jeep trcceiiiilo'sewitn'copperi a etate. 'fijAproce's's fforth'e manufa ure of"complex m o nds containing a triarylnietha 'ie dyst'u fi. cobalt an aceuumsedegiyagve, comprisingtreat prising ing the dyestufi acid of Eriochrome Cyanine f?) in presence of acetylcellulose with cobalt acetate.

6. A process for the manufacture of complex compounds containing a triarylmethane dyestufi, iron and a cellulose derivative, comprising treating the dyestuff acid of the dyestuff from one molecule oi 2 -chloro4-dirnethylaminohenzaldehyde and] 2 molecules of 2-hydroxy-3-methylbenzene-carboxylic acid in presence of nitro-cellulose with ferrous acetate.

7 A composition comprising the reaction products ohtainedhy mixing copper acetate in nitrocellulose lacquer with the dyestuif acid from Eriochrome. Azurol B.

8. A composition comprising the reaction products obtained by mixing cobalt acetate in acetyl cellulose lacguerwith the dyestufi acid of Eriochrome Cyanine 9. A composition comprising the reaction products obtained by mixing ferrous acetate in a celluloseester lacquer with the dyestufi acid of th 'd'yestufi made from. 1 mol. of, 2;.Ch10ZQQ 4- dimethyl aminobenz aldehyde and 2. mols of, 2-.- h fl x rfiemethy ben ene arbox ic idmpbsi' iqn. comp isi t e reaction products. obtainedhy ferrous acetate in nitrocellulose lacquer with the dyestufi. acid oithe dyestufl 'made" from 1 moi. of 2, -.cl1lo ro -4- dimethylaminobenzaldehyd e and 2 mols 15 2.:- hydro'xj-3-methylbengene carbo z vlic, acid, 

